Hello @Mikelson
Have you linked the son's SwissPass with your SwissPass account by any chance? If yes, then the ticket inspector can see the son's Junior card when checking your ticket (SwissPass).
If not, you can either contact the ticket counter of any station to get a replacement Junior Card valid for 2 days or you simply tell the conductor that you have left it at home and they will issue a replacement Junior Card. In both cases you pay CHF 5 for the replacement Junior Card.
Best regards,
Roland
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